v3.26.1
Fair Value Measurements (Schedule Of Assets And Liabilities At Fair Value Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale $ 27,419 $ 27,560    
Servicing Asset at Fair Value, Amount 954 970    
Derivative Asset, Estimated Fair Value 1,570 1,335    
Derivative Liability, Estimated Fair Value 1,769 1,445    
Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 27,419 27,560    
Loans held for sale 336 290    
Marketable Equity Securities carried at fair value 859 946    
Derivative Asset, Estimated Fair Value 1,570 1,335    
Derivative Liability, Estimated Fair Value 1,769 1,445    
Security Sold Short, Fair Value 44 19    
Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans held for sale 0 0    
Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 2,345 2,276    
Loans held for sale 0 0    
Marketable Equity Securities carried at fair value 859 946    
Derivative Asset, Estimated Fair Value 2 1    
Derivative Liability, Estimated Fair Value 1 0    
Security Sold Short, Fair Value 44 19    
Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans held for sale 126 221    
Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 25,072 25,282    
Loans held for sale 336 290    
Marketable Equity Securities carried at fair value 0 0    
Derivative Asset, Estimated Fair Value 1,563 1,328    
Derivative Liability, Estimated Fair Value 1,768 1,445    
Security Sold Short, Fair Value 0 0    
Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans held for sale 2 0    
Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 2 2    
Loans held for sale 0 0    
Marketable Equity Securities carried at fair value 0 0    
Derivative Asset, Estimated Fair Value 5 6    
Derivative Liability, Estimated Fair Value 0 0    
Security Sold Short, Fair Value 0 0    
Interest rate swaps | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 1,082 1,126    
Derivative Liability, Estimated Fair Value 1,316 1,265    
Interest rate swaps | Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 0 0    
Derivative Liability, Estimated Fair Value 0 0    
Interest rate swaps | Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 1,082 1,126    
Derivative Liability, Estimated Fair Value 1,316 1,265    
Interest rate swaps | Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 0 0    
Derivative Liability, Estimated Fair Value 0 0    
Interest rate options | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 20 16    
Derivative Liability, Estimated Fair Value 13 7    
Interest rate options | Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 0 0    
Derivative Liability, Estimated Fair Value 0 0    
Interest rate options | Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 15 10    
Derivative Liability, Estimated Fair Value 13 7    
Interest rate options | Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 5 6    
Derivative Liability, Estimated Fair Value 0 0    
Interest rate futures and forward commitments | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 11 8    
Derivative Liability, Estimated Fair Value 3 1    
Interest rate futures and forward commitments | Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 0 0    
Derivative Liability, Estimated Fair Value 0 0    
Interest rate futures and forward commitments | Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 11 8    
Derivative Liability, Estimated Fair Value 3 1    
Interest rate futures and forward commitments | Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 0 0    
Derivative Liability, Estimated Fair Value 0 0    
Other Contracts [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 457 185    
Derivative Liability, Estimated Fair Value 437 172    
Other Contracts [Member] | Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 2 1    
Derivative Liability, Estimated Fair Value 1 0    
Other Contracts [Member] | Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 455 184    
Derivative Liability, Estimated Fair Value 436 172    
Other Contracts [Member] | Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset, Estimated Fair Value 0 0    
Derivative Liability, Estimated Fair Value 0 0    
U.S. Treasury securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 2,345 2,276    
U.S. Treasury securities | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 2,345 2,276    
U.S. Treasury securities | Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 2,345 2,276    
U.S. Treasury securities | Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 0 0    
U.S. Treasury securities | Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 0 0    
Federal agency securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 537 543    
Federal agency securities | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 537 543    
Federal agency securities | Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 0 0    
Federal agency securities | Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 537 543    
Federal agency securities | Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 0 0    
Obligations of states and political subdivisions        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 1 2    
Obligations of states and political subdivisions | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 1 2    
Obligations of states and political subdivisions | Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 0 0    
Obligations of states and political subdivisions | Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 1 2    
Obligations of states and political subdivisions | Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 0 0    
Residential agency        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 17,634 18,387    
Residential agency | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 17,634 18,387    
Residential agency | Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 0 0    
Residential agency | Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 17,634 18,387    
Residential agency | Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 0 0    
Commercial agency        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 6,340 5,829    
Commercial agency | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 6,340 5,829    
Commercial agency | Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 0 0    
Commercial agency | Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 6,340 5,829    
Commercial agency | Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 0 0    
Commercial non-agency        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 82 82    
Commercial non-agency | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 82 82    
Commercial non-agency | Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 0 0    
Commercial non-agency | Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 82 82    
Commercial non-agency | Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 0 0    
Corporate and other debt securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 480 441    
Corporate and other debt securities | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 480 441    
Corporate and other debt securities | Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 0 0    
Corporate and other debt securities | Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 478 439    
Corporate and other debt securities | Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt securities available for sale 2 2    
Residential Mortgage        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Asset at Fair Value, Amount 954 970 $ 979 $ 1,007
Residential Mortgage | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Asset at Fair Value, Amount 954 970    
Residential Mortgage | Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Asset at Fair Value, Amount 0 0    
Residential Mortgage | Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Asset at Fair Value, Amount 0 0    
Residential Mortgage | Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Asset at Fair Value, Amount 954 970    
Commercial Real Estate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Asset at Fair Value, Amount 93 93 $ 94 $ 97
Commercial Real Estate | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Asset at Fair Value, Amount 93 93    
Commercial Real Estate | Level 1 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Asset at Fair Value, Amount 0 0    
Commercial Real Estate | Level 2 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Asset at Fair Value, Amount 0 0    
Commercial Real Estate | Level 3 [Member] | Recurring Fair Value Measurements        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing Asset at Fair Value, Amount $ 93 $ 93